DOI: 10.1055/s-00000025

Hormone and Metabolic Research

References

Melin A, Wilske J, Ringertz H, Sääf M.
Seasonal variations in serum levels of 25-hydroxyvitamin D and parathyroid hormone but no detectable change in femoral neck bone density in an older population with regular outdoor exposure. 
J Am Geriatr Soc 2001; 49: 1190-1196  

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